JP2003532038A - Compressed air operated disc brake with pressing member - Google Patents

Abstract

A disk brake, preferably a compressed air operated disk brake, comprising a caliper which encompasses the brake disk, and an actuating device which is arranged on one side of the brake disk and provided with a pivotally mounted rotary lever. The rotary lever acts upon a cross member which can be displaced in relation to the disk brake on an eccentric device provided with a pressure element. The invention is characterized in that the at least one pressure element of the eccentric device forms a spherical element.

Description

Detailed Description of the Invention

The present invention has a brake caliper surrounding a brake disc, a rotatably supported rotary lever, and a tensioning device arranged on one side of the brake disc, the rotary lever being eccentric with a pressing member. Disc brakes, preferably compressed air actuated disc brakes, which directly or indirectly act on a cross member which abuts the mechanism and is movable relative to the brake disc.

In the case of disc brakes of the type mentioned above, the transmission of force is effected by actuating a brake cylinder via a rod acting on a rotary lever. The rotating lever is mounted in the brake caliper housing using roller bearings. The shaft of the cylindrical pivot bearing of the eccentric mechanism is arranged in the notch of the rotary lever by being displaced from the rotary shaft of the rotary lever. Thereby, when the rotary lever is rotated, the spring-biased cross member moves laterally with respect to the surface of the brake disc. On the side facing the brake disc, this crosspiece acts on at least one rotary spindle which has a pressing member, which pushes the brake shoe when the brake is actuated, so that the brake lining contacts the brake disc. Disc brakes of the type described above may be implemented as a one-spindle embodiment or a two-spindle embodiment.

In the case of the known disc brakes, the moving parts, in particular the eccentric mechanism with respect to the housing and part of the bearing of the rotary lever, are implemented as maintenance-free sliding bearing boxes or as roller bearings. The rotary lever is mounted in a semi-cylindrical roller bearing box in the region of the housing opposite the brake disc. The eccentric bearing is eccentric to the bearing of the rotary lever and is supported in the semi-cylindrical notch of the rotary lever. A slide bearing in the form of a semi-cylindrical bearing box is inserted in this cutout. The transmission of force takes place by means of a cylindrical shaft.

During operation of the disc brakes, shear forces are generated due to tolerances and deformation of the bearings resulting in skewing of the bearings, as well as vibrational stresses generated during running motion and consequent mass forces. . Therefore, there is a need for suitable securing members for the rotating lever and for the cylindrical pressing member located in the bearing box to remove the shearing force. In addition, a guide surface manufactured by mechanical processing is also required. Not only is the manufacturing cost high due to the guide surface and the fixing member, but also the assembly cost of the disc brake is necessarily high. Moreover,
There is a high possibility of breakdown.

Therefore, the object of the present invention is to eliminate the shearing force generated during the operation of the compressed air actuated disk brake having the features of the preamble of the first claim without a fixing member or a guide surface. It is structurally easier to form.
The disc brakes are then even more loadable and have to be implemented in a compact construction.

The above problem is solved by the subject matter of claim 1. In that case, at least one pressing member of the eccentric mechanism is generally spherical, elliptical and / or barrel-shaped or hemispherical, and thus forms a spherical pressing member.

The shearing forces generated in the braking process are not removed via the auxiliary fixing element and the guide surfaces required therefor, but via the spherical pressing element itself. Therefore, this embodiment can be manufactured at a particularly low cost due to the reduction of parts and is also easy to assemble. Since the number of parts is reduced compared to known embodiments, the probability of failure is also reduced.

A particularly advantageous feature of the invention is that the spherical pressing element is supported in a sliding bearing box which is substantially cap-shaped, which is structurally simple in that the shearing forces generated are It is to absorb by cooperation. The spherical pressure element or its plain bearing box can then be inserted into the bridge or crosspiece and into the generally cap-shaped recess of the rotary lever or of the brake caliper and rotary lever.

The present invention can be implemented in various embodiments. That is, in the first embodiment, the bridge acts on an individual rotary spindle with a pressing member arranged approximately in the middle of the bridge, the crosspiece extending transversely to the rotary spindle and on both sides of the rotary spindle. Are respectively supported by the rotary lever via one of the spherical pressing members.

Alternatively, the crosspiece acts on individual rotary spindles arranged approximately in the middle of the crosspiece, the bridges extending on both sides of the pressing member and supported on the brake caliper via the spherical pressing member. It is also possible to act on the rotating lever.

Besides the one-spindle embodiment, suitable two-spindle examples are also feasible. That is, it is advantageous if the crosspiece acts on two pressing elements and / or rotary spindles arranged parallel to one another, the crosspiece being supported on the rotary lever via at least two spherical pressing elements. is there. Alternatively, the crosspiece acts on two pressing elements and / or rotary spindles arranged parallel to one another, the crosspiece being supported on the brake caliper via a pivot bearing and via at least one of the spherical pressing elements. Mounted on a rotating lever.

The fixing of the slide bearing is carried out by attaching or forming a tenon or a recess for preventing twisting to the cap-like slide bearing box on the cutout side, respectively.
The recess can be achieved by fitting in a correspondingly shaped blind hole in the bridge / crosspiece or on the brake disc side of the brake caliper or rotary lever.

The recess can also be formed as a hollow tenon or hollow recess that is open towards the bearing surface of the spherical box to accommodate the lubricant.

Since the number of parts is reduced compared to the known embodiments, the invention also reduces the possibility of failure. In the usual case, it is not necessary to form all plain bearing boxes as spherical boxes, since it is sufficient to form at least one plain bearing box in this shape. In yet another embodiment, at least one of the spherical pressing members is inserted into a fixedly attached spherical box and a separate rolling body is used.
The body) is movably inserted into a slide bearing box like a cap. This guarantees axial security. However, since the parts inserted in the cap-shaped plain bearing box are given a certain limited mobility,
It is possible to absorb the tolerances in the corresponding parts and the deformation caused by the movement. Preferably, the cap-shaped plain bearing box is oval-shaped for movably housing the eccentric mechanism and / or the roller body. Of course there is relatively little play.

The spherical pressing member can be formed at low cost as a roller bearing commercially available from the manufacturer. Generally, it has the highest surface quality, with surface roughness up to 1/2000 mm. The cap-shaped plain bearing box is preferably a suitable plain bearing box material with a high load capacity (for example, a babbitt with a polymer sliding layer).
, composite, compound) bearings). Alternatively, the cap-shaped plain bearing box can be manufactured from graphite.

Alternatively, a suitable plain bearing material may be attached directly to the surface of the cap-like box, for example in the form of a plain lamella, for housing the sphere.

[0017]   Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The compressed air actuated disc brake 1 shown in FIG. 1 comprises a brake disc 2 with which a brake lining 3 fixed on a brake shoe 4 comes into contact when the disc brake is actuated. The operation of the brake shoe 4 is carried out via a tensioning device 5, which is arranged in a brake caliper 6 formed in a kind of housing and which moves transversely with respect to the brake shoe 4. ) (
Or a bridge is more suitable in this case) 7, a rotatable lever 8 supported rotatably, and an eccentric mechanism (particularly member 9) eccentric to the axis of rotation of the lower eccentric segment of the rotary lever 8. Has become.

Although not shown in this figure, since the pressing rod acts on the end portion of the rotary lever 8 facing the rotary shaft of the rotary lever 8, the rotary lever 8 moves when the disc brake 1 operates. Rotate in the counterclockwise direction as shown in. The bridge 7 thereby moves against the action of the compression spring 10 in the direction of the brake shoe 3, so that tensioning of the disc brake 1 is achieved. The compression spring 10 releases the brake immediately after the braking process is completed. The rotary lever 8 is supported on the brake caliper by means of a roller-pivot bearing 11 in the case of the embodiment of FIG. In this embodiment, the roller-pivot bearing 11 is located on the side of the rotary lever 8 opposite the brake shoe 4.

The rotary lever 8 is formed in a substantially T shape, and the segment of the rotary lever 8 on the side of the eccentric mechanism is provided with a substantially hemispherical cap-shaped notch for transmitting a force into the notch. The balls 9 of the two roller bearings belonging to the eccentric mechanism are inserted in. In the drawing of FIG. 1, two notches, which are also cap-shaped, are provided in the bridge 7 at appropriate positions, and cap-shaped plain bearing boxes 12 are respectively inserted therein. Slide bearing box in the shape of a cap (calotte, spherical cap) (shell, basin, j
Ackets 12 closely surround one half of the surface of each spherical pressing member 9 which is embodied as an eccentric roller bearing ball. Cap-shaped plain bearing box 1
2 is manufactured from a wear resistant plain bearing box material.

In the embodiment of FIGS. 1 and 2, a hollow cylindrical recess 13 is formed on the side of the spherical box 12 opposite to the ball 9 of the roller bearing, the free end of which is substantially conical. There is. Permanent lubrication of the spherical box 12 in the depression 13 (lifetime lubrication)
For this purpose, a lubricant such as a lubricating oil can be filled.

The embodiment of FIGS. 1 and 2 is configured as a one-spindle embodiment because it comprises only the adjusting spindle 15 and the pressing member 14. The disc brake 1 shown in FIG. 3 is mounted for a practical vehicle having a minimum load area. Correspondingly, the dimensions are also small. Unlike the illustrated embodiment, the disc brake has two spindles.
It could also be designed as a brake. In that case, the brake shoes 4
Acts on the two pressing members 14.

In the case of the embodiment of FIGS. 3 and 4, a pivot bearing 11 is formed between the rotary lever 8 and the bridge 7. Unlike the embodiment of FIGS. 1 and 2, in this case the ball 9 of the roller bearing of the eccentric mechanism is arranged in the cutout of the rotary lever 8 opposite the brake disc 2. The cap-shaped plain bearing box 12 is also inserted into the cutout portion of the rotary lever 8. In that case, the ball 9 of the roller bearing is supported by an appropriately formed spherical cap-shaped notch of the brake caliper 6 formed inside the brake caliper. In contrast to the drawing, a cap-shaped plain bearing box 12 could also be inserted in the cutout of the brake caliper 6.

The invention is not limited to the illustrated embodiment. The important point is that at least one spherical box 12 tightly surrounds the ball 9 of the roller bearing arranged therein in order to eliminate shear forces during the braking process. The remaining cap-shaped plain bearing box 12 could be formed in such a way that the ball 9 of the roller bearing can be moved slightly inside.

[Brief description of drawings]

[Figure 1]   1 is a first sectional view of a compressed air actuated disc brake according to the present invention.

2 is a sectional view of the compressed air actuated disc brake of FIG. 1 according to the present invention rotated 90 °.

[Figure 3]   FIG. 3 is a first cross-sectional view of another compressed air actuated disc brake according to the present invention.

4 is a sectional view of the compressed air actuated disc brake of FIG. 3 according to the present invention rotated 90 °.

[Explanation of symbols]

1 disc brake 2 brake disc 3 brake lining 4 brake shoes 5 Pulling device 6 brake calipers 7 Horizontal material 8 rotation lever 9 Spherical pressing member 10 Compression spring 11 Pivot bearing 12 Sliding bearing box-spherical box 13 Mortise 14 Pressing member 15 rotating spindle 16 volts 17 bridge

[Procedure amendment]

[Submission date] January 8, 2003 (2003.1.8)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Contents of correction]

[Claims]

─────────────────────────────────────────────────── ─── Continued front page    (81) Designated countries EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, I T, LU, MC, NL, PT, SE, TR), OA (BF , BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, G M, KE, LS, MW, MZ, SD, SL, SZ, TZ , UG, ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, B Z, CA, CH, CN, CR, CU, CZ, DE, DK , DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, J P, KE, KG, KP, KR, KZ, LC, LK, LR , LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, R O, RU, SD, SE, SG, SI, SK, SL, TJ , TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW (71) Applicant Moosacher Strasse             80, 80809 Muenchen, Ge             rmany (72) Inventor Baumgartner, Hans             Germany, 85368 Moosburg,             Tonstatten 35 (72) Inventor Beaker, Dieter             83080 Oberau, Germany             Dolph, Sonneck Strasse 19 F term (reference) 3J058 AA43 AA48 AA53 AA69 AA77                       AA83 AA87 BA62 BA64 BA67                       CC04 CC57 CC66 CC78

Claims (13)

[Claims] 1. A brake caliper (6) surrounding a brake disc (2); and a rotating lever (8) rotatably supported, said brake disc (2).
And a pulling device (5) arranged on one side of the rotary lever (8) abutting against an eccentric mechanism with a pressing member (9) and movable with respect to the brake disc (2). Disc brake acting directly or indirectly on a horizontal cross member (7), preferably a compressed air actuated disc brake (1), wherein at least one of the pressing members of the eccentric mechanism is generally spherical, and Oblong,
And / or barrel-shaped or hemispherical-shaped, and thus spherical-shaped pressing members (9) are characterized. 2. Disc brake according to claim 1, characterized in that the spherical pressing member (9) is supported in a plain bearing box (12) formed in a substantially cap-like shape. 3. The plain bearing box (12) comprises: (a) the bridge / cross member (7) and the rotary lever (8); or (b) the brake caliper (6) and the rotary lever (). The disc brake according to any one of claims 1 to 2, wherein the disc brake is inserted into a substantially cap-shaped notch portion on the side opposite to the brake disc of 8). 4. The crosspiece (7) acts on an individual rotary spindle (15) having a pressing member arranged approximately in the middle of the crosspiece, the crosspiece (7) acting on the rotary spindle. 4. The rotary lever (8) according to claim 1, wherein the rotary lever (8) extends laterally with respect to each other and is supported on both sides of the rotary spindle via one of the spherical pressing members (9). The disc brake according to item 1. 5. The crosspiece (7) acts on an individual pressing member and / or a rotary spindle (15) arranged approximately in the middle of the crosspiece, the crosspiece (7) comprising the rotary spindle (7). 15) Acting on said rotary lever (8) extending on both sides of 15) and supported on said brake caliper (8) via said spherical pressing member (9). The disc brake according to any one of 1. 6. The cross member (7) acts on two pressing members and / or rotary spindles arranged parallel to one another and via at least two of said spherical pressing members (9) said rotary lever (7). The disc brake according to any one of claims 1 to 3, which is supported by 8). 7. The crosspiece (7) acts on two pressing members and / or rotary spindles arranged parallel to each other, said crosspiece being via a pivot bearing (11), which is also said spherical pressing member. Brake caliper (8) through one of (9)
Disc brake according to any one of the preceding claims, characterized in that it is mounted on the rotary lever (8) supported on the. 8. At least one of said spherical members (12) fixedly surrounds one of said spherical pressing members (9) with almost no play and is inserted into said cap-shaped plain bearing box (12). In another spherical pressing member (9) or the plain bearing box (12), the spherical pressing member (9) is a cap-shaped spherical box (9).
12) The disc brake according to any one of claims 1 to 7, which is formed so as to move in a limited manner. 9. The sliding bearing box (12) in the shape of a cap has an elliptical shape for movably housing the spherical pressing member (9). The disc brake according to item 1. 10. A ball bearing (9) according to claim 1, characterized in that the spherical pressing member inserted in the cap-shaped plain bearing box (12) is formed as a ball (9) of a roller bearing. Disc brake according to item. 11. Disc brake according to claim 1, characterized in that the ball (9) of the roller bearing has a surface roughness of less than 1/2000 mm. 12. A tenon or a recess (13) for preventing twisting is attached or formed on each of the cutout sides of the cap-shaped plain bearing box (12), and the recess is formed in the lateral direction. Disc brake according to any one of the preceding claims, characterized in that it fits into a correspondingly shaped blind hole of the material (7) or the brake caliper (6) or the rotary lever (8). 13. The tenon (13) is formed as a hollow tenon open towards the bearing surface of the spherical box (12) for housing a lubricant. The disc brake according to any one of items.